Compound trajectory lab
Project how regular contributions grow over time under different return, fee, and timeline assumptions.
Tools
Fenul calculators
Free, in-browser calculators built for Founders and owners evaluating how capital, automation, and physical assets interlock, Senior operators responsible for margin, risk, and technology leverage, and High-earning households seeking systems-level financial clarity without sales pressure. Adjust the assumptions, stress-test the outcome, and pair each run with the guide that explains the trade-offs.
Catalog
What you can run here
Every calculator below is live, free, and runs entirely in your browser — change any assumption and the output updates instantly.
Allocation drift check
Compare your current mix against a target allocation and see where drift has crept in.
Retirement runway model
Model your retirement runway from savings rate, timeline, and expected returns — then stress-test it.
Recovery requirements
See the gain required to recover from a loss, and how long recovery may take at different return rates.
Risk budgeting sketch
Weigh potential upside against downside so position-sizing decisions stay deliberate.
Options payoff explorer
Chart payoff profiles for basic options positions before committing real money.
Purchasing power & price paths
Estimate what rising prices do to purchasing power and future spending needs.
Interactive
Compound trajectory lab
Project how regular contributions grow over time under different return, fee, and timeline assumptions.
Future value
$1,185,264
Projected ending balance under the current compounding path.
Your contributions
$460,000
Starting capital plus every monthly contribution.
Investment growth
$725,264
The share created by compounding instead of deposits.
Output path
The line updates immediately as you change the assumptions.
Year 0 to Year 20
Year 0Year 10Year 20
Interactive
Allocation drift check
Compare your current mix against a target allocation and see where drift has crept in.
Enter current and target weights. The model normalizes them to 100% and flags any sleeve that sits outside your drift band.
equities
fixed Income
alternatives
cash
Largest sleeve
55%
Anything too dominant deserves extra governance.
Effective sleeves
2.6
A lower value means the portfolio behaves like fewer real bets.
Concentration score
0.39
Herfindahl-style concentration across the current weights.
equities
Current 55% vs target 60%
Drift: -5%. Keep this sleeve within +/-5% to stay inside the current policy.
fixed Income
Current 25% vs target 20%
Drift: 5%. Keep this sleeve within +/-5% to stay inside the current policy.
alternatives
Current 10% vs target 10%
Drift: 0%. Keep this sleeve within +/-5% to stay inside the current policy.
cash
Current 10% vs target 10%
Drift: 0%. Keep this sleeve within +/-5% to stay inside the current policy.
Interactive
Retirement runway model
Model your retirement runway from savings rate, timeline, and expected returns — then stress-test it.
Nominal balance
$3M
Raw dollars at the retirement start date.
Today's dollars
$2M
Inflation-adjusted view of the same future balance.
4% rule estimate
$130K
A quick annual draw estimate before tax planning.
Output path
The line updates immediately as you change the assumptions.
42 to 65
425365
Sustainable real income
$112K
Approximate annual spending in today's dollars if the portfolio must last through retirement.
Interactive
Recovery requirements
See the gain required to recover from a loss, and how long recovery may take at different return rates.
Value after drawdown
$800,000
Capital left to compound from the lower base.
Required gain
25%
Gain needed just to get back to breakeven.
Years to recover
2.9 years
At the assumed annual return with no new deposits.
Recovery map
5% drawdown5.3%
10% drawdown11.1%
20% drawdown25%
30% drawdown42.9%
40% drawdown66.7%
50% drawdown100%
Interactive
Risk budgeting sketch
Weigh potential upside against downside so position-sizing decisions stay deliberate.
Risk / reward
2.25x
Reward dollars divided by risk dollars per share.
Position size
312
Maximum shares before you exceed the trade risk budget.
Capital required
$31,200
Approximate gross exposure at the chosen entry.
Trade framing
Per-share risk
$8
Per-share reward
$18
Risk budget
$2,500
This framework assumes a single trade with one stop and one target. If your stop is likely to slip in fast markets, size down before you size up.
Interactive
Options payoff explorer
Chart payoff profiles for basic options positions before committing real money.
Breakeven
$105
Expiration price where the payoff crosses zero.
Max gain
Unlimited
Capped when the structure has a natural ceiling.
Max loss
$500
Always review this before any trade sizing discussion.
Output path
The line updates immediately as you change the assumptions.
$60 to $140
$60$100$140
Interactive
Purchasing power & price paths
Estimate what rising prices do to purchasing power and future spending needs.
Purchasing power
$55,368
Illustrative real value of idle nominal dollars after inflation— assumes zero nominal investment return.
Nominal future tag
$180,611
Rough sticker price for the same basket when inflation compounds at the rate you entered.
Nominal cumulative lift
80.6%
Percent increase from today’s dollars to the nominal future tag.
Output path
The line updates immediately as you change the assumptions.
Y0 to Y20
Y0Y10Y20
Horizon
20 years
The chart traces purchasing power if nominal dollars earn 0% while prices rise at your inflation assumption—pair with compound-growth and retirement tools when modeling returns.
Contact
Contact Fenul
Questions about a calculator or a guide? Send a note to the Fenul editorial desk — we read every message. Licensing disclosures appear wherever regulated topics are discussed.
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